Panel a: integrated intensity (zero-moment) map of the H₂O 5_5, 0−6_4, 3 ν₂ = 1 (232.68670 GHz) molecular line emission. The contours trace emission at the 3, 5, 7, 9, and 11σ levels, where 1σ = 7.13 mJy beam⁻¹ km s⁻¹. Panel b: velocity-weighted integrated intensity (first-moment) map overlaid with the contours of the continuum emission from Fig.1a in grey. The outer extent of the H₂O emission matches that of the dust continuum. Panel c: PV diagram for the H₂O emission extracted from a 5 pixel wide slice along the dashed line at PA = 25.9° as indicated in (a) and (b). The contours of the data are plotted at the 20–80% levels in steps of 10%, where 10% corresponds to ∼1σ (0.65 mJy beam⁻¹). Panel d: same as (c), but the contours indicate the best representative model using inner and outer disc radii of 30 and 120 au, respectively, a stellar mass of 45 M_⊙, and a disc inclination angle of 40°. The spatial (28 mas) and velocity resolution (1.3 km s⁻¹) are indicated by the black cross at the bottom right.